<form action="sendMessage.php" method="post" onSubmit="return isTextAreaFill ()">
                                                	<table width="100%" height="90%">
                                                    	<tr>
                                                        	<td colspan="2"><span style="color:#000">A: <?php  echo $_GET['dest'] ?></span></td>
                                                        </tr>
                                                        <tr>
                                                        	<td>
                                                            	<span style="color:#000">Object:&nbsp;</span>
                                                            </td>
                                                        	<td><span style="background: url(../wp-content/themes/theme1273/images/search-text150.gif) no-repeat left top; font-size: 12px; height: 21px; width: 150px; margin-right: 2px; float: left;"><input style="width: 145px; background: none; border: none; padding: 3px 5px; font-size: 12px;" type="text" name="object"/></span></td>
                                                        </tr>
                                                        <tr>
                                                        	<td><span style="color:#000">Content:&nbsp;</span></td>
                                                        	<td>
                                                            	<textarea style="resize:none;width:100%;" rows="5" name="con" id="con"></textarea>
                                                            </td>
                                                        </tr>
                                                        <tr>
                                                        
                                                        	<td colspan="2"><input style="color: white; background-color: black; border: none; cursor: pointer; background-image: url(images/submit.gif); width: 80px; height: 23px;" type="submit" value=""/>&nbsp;&nbsp;<input style="color: white; background-color: black; border: none; cursor: pointer; background-image: url(images/reset.gif); width: 80px; height: 23px;" type="reset" value=""/></td>
                                                        </tr>
                                                    </table>
                                                    <input type="hidden" name="desinatario" value="<?php  echo $_GET['dest'] ?>"/>
                                                </form>
                                                
<script type="text/javascript">
$ ( "#con" ).val("")
	function isTextAreaFill () {
		if ( $ ( "#con" ).val().length == 0 ) {
			alert ( "The message must have content!" );
			return false;
		}
		
		return true;
	}
</script>